如何编写一个可以还原cwd的装饰器？

问题描述

如何编写一个装饰器，将当前的工作目录还原到调用装饰的函数之前的目录？换句话说，如果我在执行 os.chdir（）的函数上使用装饰器，则在调用该函数后将不会更改cwd。

How do I write a decorator that restores the current working directory to what it was before the decorated function was called? In other words, if I use the decorator on a function that does an os.chdir(), the cwd will not be changed after the function is called.

推荐答案

模块（如果在python脚本中处理路径，则应使用该模块）具有上下文管理器：

The path.py module (which you really should use if dealing with paths in python scripts) has a context manager:

subdir = d / 'subdir' #subdir is a path object, in the path.py module
with subdir:
  # here current dir is subdir

#not anymore

（信用证转到（来自Roberto Alsina）

(credits goes to this blog post from Roberto Alsina)

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